<!DOCTYPE html>
<html>
<head>
	<script type="text/javascript" src="/static/js/thing.js"></script>
	<title>error</title>
</head>
<body>
	<h1>用户名&nbsp;或者&nbsp;密码&nbsp;为空</h1>
	
	<button onclick="previous_page()">返回上一页</button>

</body>
</html>